I bought the speaker for a friend and I have to say the following.
The sound is terrible, low and distorted. It's not worth giving 5 euros for something that doesn't serve its purpose. Get a JBL/Creative speaker for 20 euros that will do the job as a proper speaker.

It's not worth it. Cheap sound, terrible bass, it gets distorted when you increase the volume. It looks nice and small. It has slightly higher volume than my phone's speaker, Xiaomi Note4X. Don't buy it. Go for something a click better.

Very powerful sound and quite clear, I would say not necessarily that good if you put it on maximum volume! However, it is a convenient small speaker with a memory card, Bluetooth, and radio that is worth every euro! The battery, if you have it on high volume, does not last many hours, but it has a very POSITIVE aspect for me, that you can listen to music while charging it! The NEGATIVE aspect is that it starts very loudly and says a message that scares you at the beginning, and it would also be more convenient to have another volume button and another button to go to the next song-station because it is a bit strange! So, 4 stars for this detail!

Average. Strange volume controller. The battery died in the first 2 months and I have it permanently plugged in to work. It's fine for 5€!